hello,
what age is she and how long has it been since her last season? honestly, im not sure you are ready to have a litter, but are certainly going about it in a very good way...
attending shows and speaking to breed clubs (where they are actually fully functioning clubs) would be your best route for stud info and to find someone to help you with the ins and outs of preparing for a litter- with any luck they could offer to allow you to observe their own breeding/whelping. if someone offers this- jump at the chance!!!!
ozmillion seems to crop up in Many pedigrees- my girls are all actually from ozmillion lines and i did use a stud with an ozmillion-heavy pedigree... as long as it isn't too close and he compliments her; if they both have the same fault, then you would need to find another boy.
who else is in there in the pedigree? and how did she do with her health tests?
oh, and we need pictures here on yorkietalk!